For a binary mixture at constant T and P which of the activity co-efficient are thermodynamically consistent? a. Iny= -1+2x, xz?, In 72 = ?? b. Iny, = -1 + 2x x, In 72 = x? . c. Iny, = -1+2x xz?, In 72 = - d Iny = -1 + 2x1 - x?, In 72 = -x? ; =